ubantu 下安装 ElasticSearch 时遇到的问题，以及解决方式

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我是靠谱客的博主感动火车，最近开发中收集的这篇文章主要介绍ubantu 下安装 ElasticSearch 时遇到的问题，以及解决方式，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

1. 安装ElasticSearch

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.0.0.tar.gz

2.解压安装包

tar -vxf elasticsearch-6.0.0.tar.gz

3.进入bin目录执行 elasticsearch

cd elasticsearch-6.0.0/bin

./elasticsearch

这时会报一个错误

Exception in thread "main" java.lang.RuntimeException: don't run elasticsearch as root. at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:93) at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:144) at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:285) at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35) Refer to the log for complete error details.

这是elasticsearch 不支持在root用户下执行这时我们需要创建一个新的用户并赋予权限去执行

4.创建elsearch用户组及elsearch用户

groupadd elsearch
useradd elsearch -g elsearch -p elasticsearch

5.更改elasticsearch文件夹及内部文件的所属用户及组为elsearch:elsearch

cd /opt
chown -R elsearch:elsearch elasticsearch

6.切换到elsearch用户再启动

su elsearch cd elasticsearch/bin
./elasticsearch

然后又报了一个java.lang.UnsupportedOperationException: seccomp unavailable: CONFIG_SECCOMP not compiled into kernel, CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER are needed

的错误

原因是：因为不支持SecComp,而ES默认bootstrap.system_call_filter为true进行检测,所以导致检测失败,失败后直接导致ES不能启动解决:修改

解决办法是：在config下的elasticsearch.yml下增加以下内容:

bootstrap.memory_lock: false

bootstrap.system_call_filter: false

重新执行elasticsearch 又报了一个

ElasticsearchException[X-Pack is not supported and Machine Learning is not available for [windows-x86]; you can use the other X-Pack features (unsupported) by setting xpack.ml.enabled: false in elasticsearch.yml] 的错误

这是由于32位的linux系统引起的错误

解决办法是：
在elasticsearch下添加以下内容:

xpack.ml.enabled: false

然后重新启动可以成功正常启动

输入 curl 'http://localhost:9200/'

打印出

{
"name" : "-hvD4Et",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "92ZVeqSdQsusRK3wLB6aOA",
"version" : {
"number" : "6.5.4",
"build_flavor" : "default",
"build_type" : "tar",
"build_hash" : "d2ef93d",
"build_date" : "2018-12-17T21:17:40.758843Z",
"build_snapshot" : false,
"lucene_version" : "7.5.0",
"minimum_wire_compatibility_version" : "5.6.0",
"minimum_index_compatibility_version" : "5.0.0"
},
"tagline" : "You Know, for Search"
}